Route reliability record
BOS→CVG
Boston to Cincinnati
- Flights
- 2,060
- Period
- September 2025 to August 2026
- Distance
- 752 mi
- Carriers
- 3
This route lands a B, 2 points better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 2,060 BOS to CVG flights, of which Republic Airways flew 1,673 at 80.7% on time.
Best time to fly BOS to CVG: a 5am–8am departure, ideally on a Wednesday. Flights in that window arrived on time 87.4% of the time and Wednesday flights 83.9%, against 78.9% for the route overall.
The US average over the same twelve months is 77.3%, so there is little to separate this route from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
78.9%
Arrivals under 15 minutes late, of 1,996 completed flights
Avg delay
64 min
Across delayed arrivals only, not all flights
Cancelled
2.91%
National rate is 1.89%
Best carrier
Republic
80.7% on time across 1,673 flights
These figures cover 2,060 flights between September 2025 and August 2026. Beyond the headline rate, 8.0% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Carrier by carrier
Which airline is most reliable on BOS to CVG
The choice of carrier is not cosmetic here. Republic Airways arrives on time 80.7% of the time; Envoy Air manages 69.8%. Sample sizes sit next to every figure, because a two-point gap across 369 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Delta Air Linesthin sample | 18 | 94.4% | 61 min | 0.00% | A+ |
| Republic Airways | 1,673 | 80.7% | 56 min | 3.17% | B− |
| Envoy Air | 369 | 69.8% | 90 min | 1.90% | C |
Republic Airways cancels 3.2% of what it schedules here, the highest in the table. A cancelled flight never appears in an on-time rate, so read that column alongside the punctuality one rather than after it.
Flight by flight
Flights on BOS to CVG
The flight numbers below flew this route at least 250 times in the period, busiest first. Each has its own record, with its schedule and delay causes.
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Best ways to make this trip
The most reliable ways to fly Boston to Cincinnati
Every airline on this route, ranked by how often a scheduled flight actually operated and arrived on time, with its best departure time and most punctual flight number. No nearby airport pair beat these.
| Option | Airline | Success | On time | Cancelled | Best departure | Most punctual flight |
|---|---|---|---|---|---|---|
| 1. BOS → CVGBoston to Cincinnati | Republic Airways | 78.1% | 80.7% | 3.17% | 5am–8am, Wed | YX 5601 08:45 |
| 2. BOS → CVGBoston to Cincinnati | Envoy Air | 68.5% | 69.8% | 1.90% | 5pm–8pm, Fri | — |
Success is the share of scheduled flights that operated and arrived less than 15 minutes late, so a cancelled flight counts against it. “(route)” means the best time comes from every carrier on the route rather than this airline alone.
Departure window
The best time of day to leave
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 25 points, against 11 points between the best and worst carrier.
- 5am–8am100 flights87.4%
- 8am–11am402 flights86.6%
- 11am–2pm411 flights85.4%
- 2pm–5pm403 flights78.3%
- 5pm–8pm589 flights71.9%
- 8pm–5am155 flights62.9%
Scale runs 55% to 95%.
The 8pm–5am window is where this operation falls apart: 62.9% on time, against 87.4% for the 5am–8am slot. By evening the aircraft flying these rotations have absorbed a full day of small delays and there is no slack left to recover in. The 5pm–8pm window is the busiest, with 589 flights scheduled in it.
Explore
Filter BOS to CVG by airline, time, month and day
Pick a breakdown and a carrier. The dashed mark on each row is the same slice for every US flight.
On BOS to CVG, the best departure window is 5am–8am at 87.4% on time and the worst is 8pm–5am at 62.9%, a wide gap of 24.5 points. All US flights leaving 5am–8am ran 89.3%.
- 5–8am87.4%
- 8–11am86.6%
- 11am–2pm85.4%
- 2–5pm78.3%
- 5–8pm71.9%
- 8pm–5am62.9%
best all US flightsScale 55% to 95%.
Across the year
When delays peak on this route
This route's year swings by 13 points from best month to worst, which is wide. An annual average tells you very little about the week you are actually flying, so read the strip rather than the headline if your dates are fixed.
August is the worst month at 70.8% on time, 13 points below January, the best at 83.9%. Summer afternoon convection and peak-season schedules land on the same weeks every year, so this is a pattern you can book around rather than a run of bad luck. August was the busiest month here, with 200 flights.
Across the week, Wednesday is the strongest day at 83.9% on time and Sunday the weakest at 73.3%, a spread of 11 points.
Delay causes
Why this route gets delayed
Late-arriving aircraft accounts for 48% of the 27,000 delay minutes carriers reported here, and the remaining four split what is left.
- 48%Late-arriving aircraft
- 28%Carrier
- 22%National Airspace System
- 2%Extreme weather
48% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 27,000 reported delay minutes here, that single category outweighs weather by 23 to one. The split is drawn from 27,154 reported delay minutes.
The practical consequence: the 5am–8am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 87.4% on time here.
Cancellations run at 2.91%, against 1.89% nationally. That is roughly one flight in 30 cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.
Connections and stage length
What a delay here actually costs
8.0% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, which a normal layover absorbs.
The 752 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty.
The return leg runs 79.5% on time across 2,059 flights, within half a point of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.
The sample behind these figures is 2,060 flights, enough that the headline rate is stable to within roughly a point. The hour-block and month splits divide that further, so read the thinner bars with more caution than the headline.
Work out the risk of missing a connection in CVG after this flight
What to do with this
Booking this route
Put together: the delay figures matter less here than the 2.91% cancellation rate. A late arrival costs you about an hour; a cancelled flight costs you the day. Book the 5am–8am departure so there is still a schedule behind you if it goes wrong, and treat a same-day connection as optimistic. 1,996 completed flights over 12 months sit behind that.
Common questions
BOS to CVG questions
How often is BOS to CVG delayed?
About one flight in five arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 21.1% of the 2,060 flights in this analysis, against 22.7% nationally. Delayed flights are late by about an hour on average.
Which airline is most reliable on BOS to CVG?
Republic Airways leads at 80.7% on time across 1,673 flights. Envoy Air is at the other end on 69.8%, a gap of 11 points. Sample size matters as much as the percentage: a rate built from a few hundred flights moves around far more than one built from ten thousand.
What time of day has the fewest delays on BOS to CVG?
The 5am–8am departure window is the strongest at 87.4% on time. The 8pm–5am window is the weakest at 62.9%, 25 points behind. Later departures inherit delays from earlier flights the same aircraft has already flown, which is why the curve slopes the way it does.
How bad are August delays on BOS to CVG?
August is the weakest month at 70.8% on time, compared with 83.9% in January. Across the year that is 13 points between the best and worst months. Moving flexible dates out of that month is one of the few things that reliably helps.
Related
Where to go next
- CVG to BOS — the return legseparate record
- Boston Logan International (BOS) delay statistics
- Cincinnati/Northern Kentucky International (CVG) delay statistics
- Republic Airways on BOS to CVG80.7%
- Envoy Air on BOS to CVG69.8%
- BOS to DCA, a related route72.6%
- ORD to CVG, a related route72.1%
- BOS to ORD, a related route71.9%
- Delta Air Lines on-time record94.4%
- Republic Airways on-time record80.7%
- Envoy Air on-time record69.8%
- The US routes with the most cancellations
- Same route, different airline: where the carrier you pick matters most
Direction matters. BOS to CVG and CVG to BOS are scored separately because they are separate operations, with different departure banks and different aircraft. Compare the return leg.
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Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.